reductone
noun
re·duc·tone
-kˌtōn
plural -s
: any of a class of reducing enediol aldehydes or ketones RC(OH)=C(OH)COR
especially : a crystalline osone HOCH2COCHO or a tautomer [as HOCH=C(OH)CHO] that is a strong reducing agent in alkaline solution and is obtained from glucose by alkaline degradation or from dihydroxy-acetone by oxidation; hydroxy-pyruvaldehyde
ascorbic acids … may be considered as reductones 
W. W. Pigman & R. M. Goepp †1946
W. W. Pigman & R. M. Goepp †1946 
Word History
Etymology
reduction + -one
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- quinquenary
- quinquennalia
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- quinquennial
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- quinquiliteral
- quinquina
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- quinsied